/*
 * Copyright (c) 2004-2022, University of Oslo
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 *
 * 3. Neither the name of the copyright holder nor the names of its contributors 
 * may be used to endorse or promote products derived from this software without
 * specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package org.hisp.dhis.mapping;

import static com.google.common.base.Preconditions.checkNotNull;
import static org.hisp.dhis.system.deletion.DeletionVeto.ACCEPT;

import java.util.List;
import org.hisp.dhis.common.GenericAnalyticalObjectDeletionHandler;
import org.hisp.dhis.dataelement.DataElement;
import org.hisp.dhis.dataset.DataSet;
import org.hisp.dhis.expressiondimensionitem.ExpressionDimensionItem;
import org.hisp.dhis.indicator.Indicator;
import org.hisp.dhis.legend.LegendSet;
import org.hisp.dhis.organisationunit.OrganisationUnit;
import org.hisp.dhis.organisationunit.OrganisationUnitGroup;
import org.hisp.dhis.organisationunit.OrganisationUnitGroupSet;
import org.hisp.dhis.program.Program;
import org.hisp.dhis.program.ProgramIndicator;
import org.hisp.dhis.program.ProgramStage;
import org.hisp.dhis.system.deletion.DeletionVeto;
import org.springframework.stereotype.Component;

/**
 * @author Lars Helge Overland
 */
@Component
public class MapViewDeletionHandler
    extends GenericAnalyticalObjectDeletionHandler<MapView, MappingService> {
  public MapViewDeletionHandler(MappingService mappingService) {
    super(new DeletionVeto(MapView.class), mappingService);
    checkNotNull(mappingService);
  }

  @Override
  protected void registerHandler() {
    // generic
    whenDeleting(Indicator.class, this::deleteIndicator);
    whenDeleting(DataElement.class, this::deleteDataElement);
    whenDeleting(DataSet.class, this::deleteDataSet);
    whenDeleting(ProgramIndicator.class, this::deleteProgramIndicator);
    whenDeleting(OrganisationUnit.class, this::deleteOrganisationUnit);
    whenDeleting(OrganisationUnitGroup.class, this::deleteOrganisationUnitGroup);
    // special
    whenDeleting(LegendSet.class, this::deleteLegendSet);
    whenDeleting(OrganisationUnitGroupSet.class, this::deleteOrganisationUnitGroupSetSpecial);
    whenDeleting(ExpressionDimensionItem.class, this::deleteExpressionDimensionItem);
    whenVetoing(MapView.class, this::allowDeleteMapView);
    whenDeleting(Program.class, this::deleteProgram);
    whenDeleting(ProgramStage.class, this::deleteProgramStage);
  }

  private void deleteLegendSet(LegendSet legendSet) {
    List<MapView> mapViews = service.getAnalyticalObjects(legendSet);

    for (MapView mapView : mapViews) {
      mapView.setLegendSet(null);
      service.update(mapView);
    }
  }

  private void deleteProgramStage(ProgramStage programStage) {
    List<MapView> mapViews = service.findByProgramStage(programStage);

    for (MapView mapView : mapViews) {
      mapView.setProgramStage(null);
      service.update(mapView);
    }
  }

  private void deleteProgram(Program program) {
    List<MapView> mapViews = service.findByProgram(program);
    for (MapView mapView : mapViews) {
      mapView.setProgram(null);
      service.update(mapView);
    }
  }

  public void deleteOrganisationUnitGroupSetSpecial(OrganisationUnitGroupSet groupSet) {
    List<MapView> mapViews = service.getMapViewsByOrganisationUnitGroupSet(groupSet);

    for (MapView mapView : mapViews) {
      mapView.setOrganisationUnitGroupSet(null);
      service.updateMapView(mapView);
    }
  }

  private DeletionVeto allowDeleteMapView(MapView mapView) {
    return service.countMapViewMaps(mapView) == 0 ? ACCEPT : veto;
  }
}
